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Process for preparing ethyl lactate by reation and distillation using ammonium lactate as raw material

A technology of reactive distillation and ethyl lactate, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of low reaction conversion rate, complex operation, poor water removal effect, etc. Achieve the effect of simple operation process, improved conversion rate and

Inactive Publication Date: 2003-08-27
TIANJIN UNIV
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Problems solved by technology

The disadvantage of this method is that the two parts of reaction and rectification are carried out separately in the process, which not only brings the complexity of operation, but also causes the reaction conversion rate to remain at a low level due to the poor water removal effect in the reaction process. The yield of ethyl lactate is 20-21%

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  • Process for preparing ethyl lactate by reation and distillation using ammonium lactate as raw material
  • Process for preparing ethyl lactate by reation and distillation using ammonium lactate as raw material

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Embodiment Construction

[0008] The specification of the reactive distillation device adopted in the present invention is: tower body: height 1000mm, inner diameter 35mm, built-in wire mesh θ ring, filling height 900mm, tower kettle is 1000ml. The feeding amount is: ammonium lactate 86g, ethanol 270g, benzene 40g, catalyst AlCl 3 2.14g. The operating conditions are as follows: the temperature of the reactor is controlled between 75-85°C, the temperature of the tower top is between 60-67°C, the reflux ratio is 1, and the pressure of the whole system is normal pressure. The yield of ethyl lactate was 35.6%.

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Abstract

The invention discloses a technique that adopts ammonium lactate as raw material to make ethyl lacfate by rectifying. The adopted equipment includes rectifying tower, condenser on the top of tower and oil-water separator. It adopts metal halide as catalyzer and place material mol proportion of ethanol and lactic acid being 1:1 and benzene being 30%-50% of lactic acid ammonium weight. Its character: the temperature of the kettle of rectifying tower, 60-90 deg.C, that of the top of the tower, 60-70 deg.C, the pressure of the whole tower, normal, the top producing the azeotropic matter of ethanol, water and benzene, which enters into the separator through the condenser, the top of the separator set with liquid-flow mouth linked with the top of the tower, the reflux ratio, 0.5-2.0, the cleaned water at the bottom of the separator discharged outside, and the rectifying kettle producing it.

Description

technical field [0001] The invention relates to a process for preparing ethyl lactate by reactive distillation using ammonium lactate as a raw material. It belongs to the preparation technology of ethyl lactate. Background technique [0002] The "method for synthesizing ethyl lactate catalyzed by ammonium lactate" "ZL0013009.8" invented by us discloses a preparation process of ethyl lactate, which uses metal halides as catalysts and reacts ammonium lactate with ethanol , using benzene as a water-carrying agent, the obtained reaction solution is then transferred to a rectification tower for rectification to obtain the product ethyl lactate. The disadvantage of this method is that the two parts of reaction and rectification are carried out separately in the process, which not only brings the complexity of operation, but also causes the reaction conversion rate to remain at a low level due to the poor water removal effect in the reaction process. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/00C07C67/08C07C69/68
Inventor 赵学明高静
Owner TIANJIN UNIV
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